[Flow] "Comment was not printed" error with explicit inexact objects

[mirka]

We are seeing "Comment was not printed" errors when there are explicit inexact objects containing only a comment (Flow playground).

Prettier 1.19.1
Playground link

--parser babel

Input:

/** @flow */

type ThisWorks = {
  foo: 1,
  /* TODO */
  ...
};
  
type ThisAlsoWorks = {
  /* TODO */
  foo: 1,
  ...
};

type ThisDoesntWork = {
  /* TODO */
  ...
};
  
type ThisAlsoDoesntWork = {
  // TODO
  ...
};

Output:

Error: Comment "TODO" was not printed. Please report this error!
    at https://prettier.io/lib/standalone.js:15543:15
    at Array.forEach (<anonymous>)
    at ensureAllCommentsPrinted (https://prettier.io/lib/standalone.js:15541:17)
    at coreFormat (https://prettier.io/lib/standalone.js:15592:5)
    at format (https://prettier.io/lib/standalone.js:15832:75)
    at formatWithCursor (https://prettier.io/lib/standalone.js:15848:14)
    at https://prettier.io/lib/standalone.js:31794:17
    at Object.format (https://prettier.io/lib/standalone.js:31802:14)
    at formatCode (https://prettier.io/worker.js:234:21)
    at handleMessage (https://prettier.io/worker.js:185:18)

Expected behavior: